ブックタイトル「近代の文化遺産の保存理念と修復理念」英語版

概要

「近代の文化遺産の保存理念と修復理念」英語版

6Principles for Conservation and Restoration of Modern Cultural PropertiesShunsuke NakayamaHead of Modern Cultural Heritage SectionCenter for Conservation ScienceTokyo National Research Institute for Cultural Properties1. ForewordAt the Modern Cultural Properties Sectionin the Center for Conservation Science andRestoration Techniques of the Tokyo NationalResearch Institute for Cultural Properties,we have been consulted from all around thecountry on preservation, restoration, andadaptive use of various types of moderncultural heritage properties. Our approachto conservation involves on-site surveys,international research on similar culturalproperties, and gathering of information andopinions from specialists in the field. We havealso held seminars , which have providedchances for us to seek solutions, through themany presentations and exchange of ideas.　To conclude the midterm program at the endof this fiscal year 2016, we chose the theme forthis seminar to be “Principles in Conservationand Restoration,” with an approach a littledifferent from our past meetings.　Until recently, the basic approach topreservation and restoration of modern culturalproperties has been to follow methods whichhad been established through past experienceson treatment of cultural properties up to theEdo period. I do not intend to say that this wayof thinking was incorrect.　There are many common directions such as“preserving as much as possible of the originalstate” or “when restoration is required, caremust be taken to retain the original elements(1) Concrete StructuresA representative deterioration mechanismthat appears in concrete structures iscarbonization. This occurs when concretechanges from alkaline towards neutral from thestructural surface. Rust will then form on steelreinforcement bars and may result in cracks onthe concrete surface. If the covering concretepeels off exposing the reinforcement, furthercorrosion will be induced (Photo 1).　No definitive methods have been proposedand select reversible methods employingremovable materials.”　It is not necessary to alter these simple ideas,and I believe they are applicable to all types ofcultural properties.　Nevertheless, as soon as we begin to actuallyhandle properties of our modern culturalproperties, we realize that it is not easy tofollow these two ideas, however simple theymay seem at first. Confronted by the subjectsto be restored, although we often questionourselves if this is only a matter of ideas, wesoon realize that there is probably more to thisproblem.　Principles should be something stable andshould not allow changes from time to time.This is why I have come to the conclusion thatwhat troubles us at each site may not be rootedin these ideas.2. Approaches Taken at RestorationSites